Background: Seasonal variations in mood and behaviour, termed seasonality, are commonly reported in the general
population. As a part of a large cross-sectional health survey in Hordaland, Norway, we investigated the ...

Background: Previous research suggests a possible link between insomnia and mortality, but findings are mixed and well-controlled studies are lacking. The aim of the current study was to examine the effect of insomnia ...

microRNAs (miRNAs) are major regulators of protein synthesis in the brain. A major
goal is to identify changes in miRNA expression underlying protein synthesis-dependent
forms of synaptic plasticity such as long-term ...

We report data collected in a representative sample of 17-year-old Norwegians to investigate prevalence rates of non-problem, risk, and problem gambling, as measured by the Problem Gambling Severity Index (PGSI). In addition, ...

Workaholism has become an increasingly popular area for empirical study. However, most studies examining the prevalence of workaholism have used non-representative samples and measures with poorly defined cut-off scores. ...

Delayed sleep phase disorder (DSPD) is a disorder where the circadian rhythm is delayed according to the
conventional norms, often resulting in school- and work related difficulties as well as emotional challenges. Research ...

Delayed sleep phase disorder (DSPD) is a circadian rhythm sleep disorder. Patients with DSPD have
problems initiating sleep if they go to bed at a conventional time and they often have problems waking at
desired times. ...

The aim of this study was to examine the relationship between the structural characteristics and gambling behavior among video lottery terminal (VLT) gamblers. The study was ecological valid, because the data consisted of ...

Background: This study investigates the prevalence of symptoms of shift work disorder in a sample of nurses, and its association to individual, health and work variables. Methodology/Principal Findings: We ...